As I keep saying, he was as stubborn on reservations to the League--at least any that would impair Article X-- before his stroke as after. Here is John Milton Cooper in
Woodrow Wilson: A Biography discussing the situation in August 1919 (before the stroke):
"On Capitol Hill, prospects for bipartisan cooperation briefly looked bright. Some mild reservationists were reaching across party lines, although the New York World reported that "a get-together movement" between them and Democrats was "still in the conference stage." Key Pittman of Nevada, a Democrat, later recalled that he felt confident about reaching an agreement. That confidence was excessive. The mild reservationists were divided among themselves; a few blew hot and cold about how is to go in accommodating the Democrats, and some of them supported reservations that were not so mild. At the middle of August, Lodge enlisted Root's help in trying to bring two of them, LeBaron Colt of Rhode Island and Frank Kellogg of Minnesota, back into line behind "a real reservation" on Article X—one that would limit American commitments to enforce collective security actions by the League Council. In the end, those two senators and all but one of the mild reservationists—McCumber of North Dakota—would support Lodge's position on Article X and the whole treaty.
"Wilson dashed these hopes for bipartisan cooperation. On August 11, when Lansing also suggested an accommodation with the mild reservationists, the president "would have none of it, and his face took on that stubborn and pugnacious expression which comes whenever anyone tells him a fact which interferes with his plans.". Four days later, Wilson authorized the ranking Democrat on the Foreign Relations Committee, Gilbert Hitchcock, to tell the press that the president did not believe any compromise should be discussed or negotiated yet, although one might be eventually. Wilson's reasons for this intransigent turn evidently sprang from the fear he expressed to McAdoo about opening the door to more stringent reservations. He was making a serious mistake: an accommodation with the mild reservationists could have strengthened his hand with the Senate and put pressure on other Republicans..."
https://books.google.com/books?id=xOZVsyO4K2cC&pg=PA514